CentOS / RHEL

1) Download the latest version of the Webmin Control Panel. You will want to use the RPM Build.

# wget https://prdownloads.sourceforge.net/webadmin/webmin-1.730-1.noarch.rpm

2) Install the package:

# rpm -ivh webmin-1.730-1.noarch.rpm

3) After installation, your webmin installation will be available via HTTP at https://<your server IP>:10000.

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Ubuntu / Debian

1) Download the latest version of Webmin Control Panel suitable for Ubuntu/Debian. You will need the .deb package.

# wget https://prdownloads.sourceforge.net/webadmin/webmin_1.730_all.deb

2) Install the package using dpkg.

# dpkg -i webmin_1.730_all.deb

3) Your installation will now be available via HTTP at https://<your server IP>:10000

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Change Webmin Port from default of 10000

If you wish, you can change the default port for Webmin from port 10000 to something else that would be more obscure.

1) Open /etc/webmin/miniserv.conf in your text editor of choice.

2) Change the listen=10000 value to your desired port.

3) Restart the Webmin service.

# service webmin restart

Sumber: https://devops.profitbricks.com/tutorials/setup-webmin-control-panel-on-your-server/